Plastic barrel, imaging lens module and electronic device

A plastic barrel, comprising:

• an object-end portion comprising:
• an outer object-end surface;
• an object-end hole;
• and
• an inner annular object-end surface connected to the outer object-end surface and surrounding the object-end hole;
• an image-end portion comprising:
• an outer image-end surface;
• an image-end opening;
• and
• an inner annular image-end surface connected to the outer image-end surface and surrounding the image-end opening;
• a tube portion connecting the object-end portion and the image-end portion, wherein the tube portion comprises:
• a plurality of inclined surfaces, wherein an angle is between each of the inclined surfaces and a central axis of the plastic barrel;
• and
• a plurality of wedge structures, which are disposed on at least one surface of the inner annular object-end surface, the inner annular image-end surface and the inclined surfaces, wherein the wedge structures are regularly arranged around the central axis, and each of the wedge structures comprises:
• an acute end;
• and
• a tapered section connecting the surface, which the wedge structure is disposed on, and the acute end.